package threading;

class Counter {
    private int count = 0;
    private Object object = new Object();
    public void add() {
        synchronized (object) {
            count++;
        }
    }

    //对该对象进行加锁
   /* public void add() {
        synchronized (this) {
            count++;
        }
    }*/
    //此时也是针对 this(当前对象) 加锁，只不过这里进入 add()方法就会加锁,结束add() 方法自动释放锁。
    /*synchronized public void add() {
            count++;
    }*/
    public  int getCount() {
        return count;
    }
}
public class ThreadDemo12 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();
        Thread t1 = new Thread( () -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });
        Thread t2 = new Thread( () -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });
        t1.start();
        t2.start();

        t1.join();
        t2.join();

        System.out.println(counter.getCount());
    }
}
